Further to my thread on problems creating a LIVE USB drive (the solution was to use dd, gparted, then mkdir -p /mnt/my_usb etc from the original tutorial).
I've now got a LIVE USB drive working with persistence, at least it remembers my Desktop settings so I guess it's working.
However, it doesn't seem to update properly. If I run this command:
apt-get clean && apt-get update && apt-get upgrade && apt-get dist-upgrade -y
it reports that there are 156 upgraded files, so I enter Y to continue. It then proceeds to download all the files, but if I run the command again, it tells me exactly the same thing.
What have I done wrong?